Welcome. I passed near your area a few times with FedEx along I-15. It's really pretty up there. Good luck with your goal. Those pennies do add up in the long run.
BEVs of the required range are still pricey, and the "cheap" ones are too new to used examples readily available. Just shifting some miles to electric with a plug in hybrid will help though. Plus, the hybrid part likely does better than what they get in their current car. Just replacing that car with a hybrid would help.